Conveners
Workshop on QCD
- Owe Philipsen (Goethe University Frankfurt)
Workshop on QCD
- Lorenz von Smekal (Justus-Liebig University Giessen)
Workshop on QCD
- Christian Fischer (JLU Gießen)
Workshop on QCD
- Jeff Greensite (San Francisco State University)
-
Prof. Christian Fischer (JLU Gießen)22/08/2019, 11:00Workshop on QCDOral Presentation
We present new results for fluctuations of the baryon number for QCD with
Go to contribution page
Nf=2+1 quark flavours at non-zero temperature and chemical potential [1].
These are extracted from a framework based on a combination of lattice QCD
and Dyson-Schwinger equations. In previous works ([2], see [3] for a review)
we found a critical end point in the region ($T^c,\mu_B^c$)=(120,500) MeV.
We discuss... -
Bernd-Jochen Schaefer22/08/2019, 11:30Workshop on QCDOral Presentation
Low-energy QCD at finite temperatures and baryochemical densities predicts a phase transition from a chiral symmetry broken hadronic phase to a chirally restored quark-gluon plasma phase. In this talk the two and three quark flavor chiral phase structure with and without an axial U(1)-symmetry breaking is the major focus. The current status of low-energy QCD effective models is briefly...
Go to contribution page -
Dr Eugenio Megias (University of Granada)22/08/2019, 12:00Workshop on QCDOral Presentation
Fluctuations of conserved charges such as baryon number, electric charge and strangeness [1,2] may provide a test for completeness of states in lattice QCD for three light flavors [3-7]. We elaborate on the idea that the corresponding susceptibilities can be saturated with excited baryonic states with an underlying quark-diquark structure with a linearly confining interaction. Using...
Go to contribution page -
Prof. Jeff Greensite (San Francisco State University)22/08/2019, 12:30Workshop on QCDOral Presentation
We point out a distinction, in gauge theories with matter in the fundamental representation, between color confinement and a stronger version of confinement, which we call “separation of charge” confinement. The latter is a generalization of the Wilson area-law criterion to gauge+matter theories . In gauge-Higgs theories, we show that the transition (which is not necessarily a thermodynamic...
Go to contribution page -
Prof. Hugo Reinhardt (Tübingen University)22/08/2019, 13:00Workshop on QCDOral Presentation
The branching of center vortices in SU(3) Yang-Mills theory in maximal center gauge is analyzed. When properly normalized, one can define a branching probability that turns out to be independent of the lattice spacing (in the limited scaling window studied here). The branching probability shows a rapid change at the deconfinement phase transition which is much more pronounced in space slices...
Go to contribution page -
Leonid Glozman22/08/2019, 15:00
Given the solution of Nf=2 QCD on the lattice
with a chirally symmetric Dirac operator
and symmetry classification of the QCD Lagrangian
we identify the following three physically different regimes
of QCD.Up to the pseudo-critical temperature Tc
Go to contribution page
the QCD matter is a hadron gas with broken chiral symmetries.
From the hadron gas regime below Tc there is a crossover to
a regime with chiral and... -
Semeon Valgushev (Brookhaven National Laboratory)22/08/2019, 15:30Oral Presentation
We discuss dense cool QCD where a region with spatially inhomogeneous condensates may emerge. In that case, QCD phase diagram may exhibit a Lifshitz regime, which can appear either instead of, or in addition to Critical End Point. We study the Lifshitz regime using a combination of large-N expansion and numerical lattice simulations.
Go to contribution page -
Jan M. Pawlowski (University of Heidelberg)22/08/2019, 16:30Oral Presentation
In this talk recent progress on the phase structure of QCD and transport processes with the functional renormalisation group are reviewed. I present an update of the phase boundary that is in agreement with recnet lattice results. At larger density we also find indictations for an inhomgeneous phase as well as a critical end point.
The method is also used for the computation of transport...
Go to contribution page -
Prof. Owe Philipsen (Goethe University Frankfurt)22/08/2019, 17:00Oral Presentation
During the last years it has become possible to address the cold and dense regime of QCD directly for
Go to contribution page
sufficiently heavy quarks, where combined strong coupling and hopping expansions are convergent and a
3d effective theory can be derived, which allows to control the sign problem either in simulations or by fully
analytic calculations. In this
contribution we review the effective theory... -
Prof. Lorenz von Smekal (Justus-Liebig University Giessen)22/08/2019, 17:30Oral Presentation
The Functional Renormalization Group (FRG) can be used to calculate spectral functions from analytically continued FRG flow equations for two-point correlation functions. Here we report on the current status of applying this aFRG framework to the calculation of vector and axial-vector meson spectral functions in effective hadronic theories at finite temperature and density. Their medium...
Go to contribution page -
Thierry Grandou (UMR-CNRS-7335, INLN, France.)22/08/2019, 18:00Oral Presentation
Some years ago, relying on standard functional manipulations, a new property of QCD fermionic Green’s functions has been put forth and called effective locality. This feature of QCD is non-perturbative, as resulting from a full integration of the gluons degrees of freedom. At least at quenching and a mild eikonal approximation, the relation of effective locality to dynamical chiral symmetry...
Go to contribution page -
peter tsang22/08/2019, 18:30
Using previously described functional techniques for some non–perturbative, gauge invariant, renormalized QCD processes, a simplified version of the amplitudes — in which forms akin to Pomerons naturally appear — provides fits to ISR and LHC–TOTEM pp elastic scattering data.
Go to contribution page
Those amplitudes rely on a specific function φ(b) which describes the fluctuations of the transverse position of quarks... -
Peter Lowdon (Ecole Polytechnique)22/08/2019, 19:00Oral Presentation
Local formulations of quantum field theory imply that gauge theory propagators can potentially contain generalised infrared poles. In this talk I will outline the theoretical significance of these components, and report on recent lattice fit results for the gluon propagator.
Go to contribution page -
Prof. Willibald Plessas (Institute of Physics, University of Graz)23/08/2019, 11:00
We present a relativistic constituent-quark model extended to describe all known baryons on a uniform basis. The corresponding Poincaré-invariant mass operator relies on a linear confinement and a hyperfine interaction derived from Goldstone-boson exchange. The relativistic three-quark system is solved along modified Faddeev equations adapted to treat long-range interactions. While the...
Go to contribution page -
Aalok Misra (Indian Institute of Technology Roorkee, India)23/08/2019, 11:30
From a UV-complete top-down holographic dual of large-N thermal QCD at finite gauge coupling, we discuss a variety of topics like obtaining a lattice-compatible T_c, conformal anomaly, lattice/PDG-compatible glueball/meson spectroscopy and glueball-to-meson decays, speed of sound, (lattice-compatible) shear viscosity(eta)-to-entropy density ratio's variation with temperature, bulk...
Go to contribution page -
Hideo Suganuma (Kyoto University)23/08/2019, 12:00Oral Presentation
We study various topological objects corresponding to baryons in holographic QCD [1,2,3]. The holographic QCD is constructed with D4 and D8-branes in the superstring theory, and is equivalent to 1+3 dimensional QCD in an infrared region. We investigate instantons and monopoles topologically appearing in holographic QCD in two-flavor case.
[1] T. Sakai and S. Sugimoto, Prog. Theor. Phys. 113...
Go to contribution page -
Dr Vasiliki Kouskoura (Brookhaven National Laboratory (US))23/08/2019, 12:30Oral Presentation
The production of prompt isolated photons, W-bosons and Z-bosons in proton-proton collisions provides a stringent test of perturbative QCD and yields important information about the parton distribution functions (PDFs) for quarks within the proton. In this talk, we present precision measurements of these final states across four different proton-proton centre-of-mass energies using data...
Go to contribution page